Electro-magnet



(No Model.)

W. J. WESSENBERG 8n H. F. WILBUR.

ELECTROMAGNET.

No. 531,709. Patented Jan. 1, 1895.

WW I 524mm 7 Jig/WA UNITED STATES PATENT OFFICE.

VILLIAM J. XVESSENBERG AND HORATIO F. WILBUR, OF MERIDEN, CONNECTICUT.

ELECTRO-MAGN ET.

SPECIFICATION forming part of Letters Patent No. 531,709, dated January 1, 1895,

Application filed September 27, 1894. Serial No. 524,280. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM J. WEssEN- BERG and HoRArIo F. WILBUR, citizens of the United States, residing at Meriden, in the county of New Haven and State of Connecti out, have invented certain new and useful Improvements in Eleotro-Magnets, of which the following is a specification.

Our invention relates to magnets for operating signals and the chief object of our improvement is general efficiency, whereby the signal may be operated with a lighter battery and consequently with greater economy.

In the accompanying drawings, Figure 1 is a side elevation of our magnet. Fig. 2 is a front elevation thereof with the armature shaft in section and the cap of the frame removed, and Figs. 3 and 4 are similar views of the armature and ends of the magnet cores showing them in difierent positions.

A designates the main portion of the frame and B is its cap.

0 is an ordinary wound magnet having the ends of its cores 5 beveled off on straight lines at an angle of thirty degrees, said bevels sloping toward the plane which passes centrally between said cores whereby they are opposing bevels. The armature shaft 6 is mounted in said central plane and at a distance from the ends of the cores about equal to the distance from center to center of said cores. The segmental armatureD is mounted on said shaft 6 and is thereby mounted concentrically with reference to said beveled ends of the cores. The entire armature occupies nearly ninety degrees of the circle on which it swings. The edge of the armature has two compound faces separated bya space 7, the distance from the center of one face to the center of the other being about equal to the distance from center to center of the cores. The forward part 8 of each face is concentric while the rear part 9 of each face is tangential to said concentric portion and stands at about a right angle to a line drawn from its junction with the concentric portion to the armature axis as indicated by the broken lines 10. The radius of the concentric portion of ing in front of the cores it will come close to the beveled ends while atthe same time they are without the path of said beveled ends thereby bringing the beveled ends of the core within the path of the tangential portions of said compound faces.

A stop 11 preferably a yielding spring is set in the path of the armature to limit its movement in the forward direction but which will allow the armature to place itself in the center of the field, that is centrally between the magnet cores as shown in Fig. 4C.

The armature shaft 6 may be provided with any suitable operating lever as at 12 for connectingit with a signal.

The armature when connected with what ever it is to operate should be so balanced as to stand in the position shown in Figs. 1 and 2 when no current is passing through the magnet. Upon electrifying the magnet the disposition of the armature to place itself in the center of the field will first cause the armature to move in the direction to carry its faces into a position in front of the cores. This disposition or force is the strongest at the start and gradually weakens as the armature reaches its central position between the cores. The tangential portions of thefaces now come into action and are drawn directly toward the core by What may be termed the axial attraction of the cores whereby as the first disposition or force decreases the second disposition or force increases and continues to increase to the end of the armatures stroke. The stop although elastic should be strong enough when compressed to stop the arma ture with the tangential faces a trifle short of actual contact with the beveled ends of the cores. Upon cutting off the current through the magnet the armature will return to its former position. Fig. 2, shows the armature as withdrawn from the cores. Fig. 3, shows its intermediate position and Fig. 4:, its position in the center of the field.

By our improvements a signal may be operated by a battery with fewer cells.

We claim as our invention- The combination of the magnet C having the compound face 8. 9. is such that in swingthe ends of its cores beveled off on straight lines in opposing bevels, and the segmental tially as described and for the purpose speciarmature concentrically mounted with referfied. ence to said beveled ends and having two WILLIAM J. WESSENBERG. compound faces the forward part of each 5 face being concentric and the rear part tan- HORATIO WILBUR' gential thereto, said compound faces being a \Vitnesses:

distance apart about equal to the distance JAMES SHEPARD,

from center to center of said cores, substan- C. D. Looms, Jr. 

